Efeito dos parâmetros de retificação no acabamento superficial de cerâmicas avançadas

Abstract

The advanced ceramics shows a wide application, from components for the electronic industry to implants and prostheses. In the last decades the bioceramic has been drawing attention in applications such as bone prostheses and dental implants because it presents bioinert and bioactive material characteristics, with good biocompatibility, and high compressive strength. We studied the effect of grinding parameters for ceramics with high alumina, prepared with three different particle sizes by examining the surface finish of these ce-ramics. During the grinding process, the parameters were: table speed (55 mm / s 250 mm / s) and the depth of cut (5 μm and 60 μm). Apart from these parameters, two cooling types were used: conventional cooling and MQL (Minimum Quantity Lubricant). The results obtained through the roughness of the grinded surface and statistical analyzes showed a reduction in the roughness of the parts with small and medium grain size when using MQL cooling. The ceramics with small grain size grinded with a table speed of 55 mm/s and depth of cut of 60 μm showed roughness of less than 0.28 μm using the MQL cooling system. However, when grinded at higher speeds using MQL the ceramics with smaller grain size showed an increase in surface roughness values.